Everyone’s going mobile in travel these days—and if you thought you’d heard enough of that already, think again.

It’s just the beginning. Proving that is Marriott Hotels, which today launches mobile checkout at all of its 329 hotels nationwide and another 20 international properties (all 500 will be on board later this year).

While other hotels and resorts have individually brought mobile checkout to life—I just checked out of the Aria in Las Vegas without even stopping at the front desk—Marriott’s move marks the first brand-wide conversion of its scale, and is no question a signifier of what’s to come for the rest of the industry.